WIP: prototype for ManagedObjectProtocol

Sources/Setup/Dynamic Models/ManagedObjectProtocol.swift

@@ -0,0 +1,119 @@
+//
+//  ManagedObjectProtocol.swift
+//  CoreStore
+//
+//  Copyright © 2017 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+import Foundation
+
+
+// MARK: - ManagedObjectProtocol
+
+public protocol ManagedObjectProtocol: class {
+
+    static func cs_forceCreate(entityDescription: NSEntityDescription, into context: NSManagedObjectContext, assignTo store: NSPersistentStore) -> Self
+    
+    static func cs_from(object: NSManagedObject) -> Self
+}
+
+public extension ManagedObjectProtocol where Self: ManagedObject {
+    
+    public typealias Attribute = AttributeContainer<Self>
+    
+    @inline(__always)
+    public static func keyPath<O: ManagedObject, V: ImportableAttributeType>(_ attribute: (Self) -> AttributeContainer<O>.Required<V>) -> String  {
+        
+        return attribute(self.meta).keyPath
+    }
+    
+    @inline(__always)
+    public static func keyPath<O: ManagedObject, V: ImportableAttributeType>(_ attribute: (Self) -> AttributeContainer<O>.Optional<V>) -> String  {
+        
+        return attribute(self.meta).keyPath
+    }
+    
+    @inline(__always)
+    public static func `where`(_ condition: (Self) -> Where) -> Where  {
+        
+        return condition(self.meta)
+    }
+    
+    
+    // MARK: Internal
+    
+    internal static var meta: Self {
+        
+        return self.init(asMeta: ())
+    }
+}
+
+
+// MARK: - NSManagedObject
+
+extension NSManagedObject: ManagedObjectProtocol {
+    
+    // MARK: ManagedObjectProtocol
+    
+    public static func cs_from(object: NSManagedObject) -> Self {
+        
+        @inline(__always)
+        func forceCast<T: NSManagedObject>(_ value: Any) -> T {
+            
+            return value as! T
+        }
+        return forceCast(object)
+    }
+    
+    public static func cs_forceCreate(entityDescription: NSEntityDescription, into context: NSManagedObjectContext, assignTo store: NSPersistentStore) -> Self {
+        
+        let object = self.init(entity: entityDescription, insertInto: context)
+        defer {
+            
+            context.assign(object, to: store)
+        }
+        return object
+    }
+}
+
+
+// MARK: - ManagedObject
+
+extension ManagedObject {
+    
+    // MARK: ManagedObjectProtocol
+    
+    public static func cs_from(object: NSManagedObject) -> Self {
+        
+        return self.init(object)
+    }
+    
+    public static func cs_forceCreate(entityDescription: NSEntityDescription, into context: NSManagedObjectContext, assignTo store: NSPersistentStore) -> Self {
+        
+        let type = NSClassFromString(entityDescription.managedObjectClassName!)! as! NSManagedObject.Type
+        let object = type.init(entity: entityDescription, insertInto: context)
+        defer {
+            
+            context.assign(object, to: store)
+        }
+        return self.init(object)
+    }
+}